参数资料
型号: ADC08038CIN
厂商: NATIONAL SEMICONDUCTOR CORP
元件分类: ADC
英文描述: 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function
中文描述: 8-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP20
封装: 0.300 INCH, DIP-20
文件页数: 11/24页
文件大小: 552K
代理商: ADC08038CIN
Functional Description
(Continued)
enabled and whether this input is single-ended or differential.
Differential inputs are restricted to adjacent channel pairs.
For example, channel 0 and channel 1 may be selected as a
differential pair but channel 0 or 1 cannot act differentially
with any other channel. In addition to selecting differential
mode the polarity may also be selected. Channel 0 may be
selected as the positive input and channel 1 as the negative
input or vice versa. This programmability is best illustrated by
the MUX addressing codes shown in the following tables for
the various product options.
The MUX address is shifted into the converter via the DI line.
Because the ADC08031 contains only one differential input
channel with a fixed polarity assignment, it does not require
addressing.
The common input line (COM) on the ADC08038 can be
used as a pseudo-differential input. In this mode the voltage
on this pin is treated as the “” input for any of the other input
channels. This voltage does not have to be analog ground; it
can be any reference potential which is common to all of the
inputs. This feature is most useful in single-supply applica-
tions where the analog circuity may be biased up to a poten-
tial other than ground and the output signals are all referred
to this potential.
TABLE 1. Multiplexer/Package Options
Part
Number
Number of Analog
Channels
Single-Ended
1
2
4
8
Number of
Package
Pins
Differential
1
1
2
4
ADC08031
ADC08032
ADC08034
ADC08038
8
8
14
20
TABLE 2. MUX Addressing: ADC08038
Single-Ended MUX Mode
MUX Address
SGL/
DIF
1
1
1
1
1
1
1
1
Analog Single-Ended Channel
#
3
4
START
ODD/
SIGN
0
0
0
0
1
1
1
1
SELECT
1
0
0
1
1
0
0
1
1
0
1
2
5
6
7
COM
0
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
+
+
+
+
+
+
+
+
TABLE 3. MUX Addressing: ADC08038
Differential MUX Mode
MUX Address
SGL/
DIF
0
0
0
0
0
0
0
0
Analog Differential Channel-Pair
#
1
2
3
START
ODD/
SIGN
0
0
0
0
1
1
1
1
SELECT
1
0
0
1
1
0
0
1
1
0
2
3
0
0
1
0
1
0
1
0
1
0
+
1
4
5
6
7
1
1
1
1
1
1
1
1
+
+
+
+
+
+
+
A
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